<template>
	<view>
		<!-- search组件 -->
		<my-search @click="gotoSearch"></my-search>
		
		<view class="scroll-view-container">
			<!-- 左侧的滑动区块 -->
			<scroll-view class="left-scroll-view" scroll-y="true" :style="{height: wh + 'px'}">
				<block v-for="(item,i) in cateList" :key="i">
					<view :class="['left-scroll-view-item', i === active ? 'active':'']"
					@click="activeChang(i)"
					>{{item.cat_name}}</view>
				</block>
			</scroll-view>
			<!-- 右侧的滑动区块 -->
			<scroll-view class="right-scroll-view" :scroll-top="scrollTop" scroll-y="true" :style="{height: wh + 'px'}">
				<view class="cate-lv2" v-for="(item,index) in cateList2" :key="index">
					<!-- 二级标题 -->
					<view class="cate-lv2-title"> / {{item.cat_name}} / </view>
					<!-- 三级菜单 -->
					<view class="cate-lv3-list">
						<view class="cate-lv3-item" 
						v-for="(item2,index2) in item.children" :key="index2"
						@click="gotoGoodsList(item2)"
						>
							<image :src="item2.cat_icon"></image>
							<text>{{item2.cat_name}}</text>
						</view>
					</view>
				</view>
			</scroll-view>
		</view>
	</view>
</template>

<script>
	import tabBar from '@/mixins/tarbar.js'
	export default {
		mixins:[tabBar],
		data() {
			return {
				// 当前设备可用高度
				wh:0,
				// 一级数据
				cateList:[],
				// 二级分类数据
				cateList2:[],
				// 状态值
				active:0,
				scrollTop:0
			};
		},
		onLoad(){
			// 获取当前屏幕可用高度
			const sysInfo = uni.getSystemInfoSync()
			this.wh = sysInfo.windowHeight - 42 // 减去搜索所占的高度
			
			this.getCateList()
		},
		methods:{
			async getCateList(){
				let {data:res} = await uni.$http.get('/api/public/v1/categories')
				if(res.meta.status !== 200) return uni.$showMsg()
				this.cateList = res.message
				this.cateList2 = res.message[0].children
			},
			activeChang(i){
				this.active = i
				// 重新为二级分类
				this.cateList2 = this.cateList[i].children
				this.scrollTop = this.scrollTop === 0 ? 0.1:0
			},
			gotoGoodsList(item){
				uni.navigateTo({
					url:'/subpkg/goods_list/goods_list?cid=' + item.cat_id
				})
			},
			gotoSearch(){
				// 跳转页面
				uni.navigateTo({
					url:'/subpkg/Search/Search'
				})
			}
			
		}
		
	}
</script>

<style lang="scss">
.scroll-view-container{
	display: flex;
	.left-scroll-view{
		width: 120px;
		.left-scroll-view-item{
			background-color: #f7f7f7;
			line-height: 60px;
			text-align: center;
			font-size: 12px;
		}
		& .active{
			background-color: #ffffff;
			position: relative;
			&::before{
				content: '';
				display: block;
				width: 3px;
				height: 30px;
				background-color: #c00000;
				position: absolute;
				top: 50%;
				left: 0;
				transform: translateY(-50%);
			}
		}
	}
	.right-scroll-view{
		.cate-lv2-title{
			font-size: 12px;
			font-weight: bold;
			text-align: center;
			padding: 15px 0;
		}
		.cate-lv3-list{
			display: flex;
			flex-wrap: wrap;
			.cate-lv3-item{
				width: 33.3%;
				display: flex;
				flex-direction: column;
				justify-content: center;
				align-items: center;
				margin-top: 10px;
				image{
					width: 60px;
					height: 60px;
				}
				text{
					font-size: 12px;
				}
			}
		}
	}
	
}
</style>
